[1] Bazazian D, Casas J R, Ruiz-Hidalgo J. Fast and robust edge extraction in unorganized point clouds. [C]∥International Conference on Digital Image Computing: Techniques and Applications, IEEE, 1-8(2016).

[2] Sun D Z, Fan Z X, Li Y R. Automatic extraction of boundary characteristic from scatter data[J]. Journal of Huazhong University of Science and Technology (Natural Science), 36, 82-84(2008).

[3] Chen Y R, Wang Y B, Peng Z J et al. Improved algorithm for extraction of boundary characteristic point from scattered point cloud[J]. Computer Engineering and Applications, 48, 177-180(2012).

[4] Ke Y L, Fan S Q. Research on direct extraction of boundary from point clouds[J]. Chinese Journal of Mechanical Engineering, 40, 116-120(2004).

[5] Demarsin K, Vanderstraeten D, Volodine T et al. Detection of closed sharp edges in point clouds using normal estimation and graph theory[J]. Computer-Aided Design, 39, 276-283(2007). http://www.sciencedirect.com/science/article/pii/S0010448506002260

[6] Liu H, Li D, Yu Z G et al. Boundary point extraction of point cloud based on range image[J]. Journal of Water Resources and Architectural Engineering, 11, 156-158(2013).

[7] Zhang Z J, Wei X, Zhou Z Q et al. 8N-DD-based point cloud edge extraction algorithm[J]. Chinese Journal of Scientific Instrument, 38, 2015-2021(2017).

[8] Xi X, Wan Y, Wang C. Building boundaries extraction from points cloud using an image edge detection method. [C]∥Geoscience and Remote Sensing Symposium, IEEE, 1270-1273(2016).

[9] Liu Z Y, Jiang K Y, Lin J Y. Interactive extraction of boundary of specified target feature on scattered point cloud[J]. Computer Engineering and Applications, 52, 186-190(2016).

[10] Zhou X L, Wan W G. Efficient boundary points extraction method for scattered point cloud of endocardium[J]. Application Research of Computers, 29, 3942-3944(2012).

[11] Tao Y B, Lin H, Bao H J. Kd-tree based fast ray tracing for RCS prediction[J]. Progress in Electromagnetics Research, 81, 329-341(2008).

[12] Liao L Q, Bai J S, Luo D A. Integrated point cloud storage structure based on octree and KD tree[J]. Computer Systems & Applications, 21, 87-90(2012).